Baldyga



Feb. 7, 1956 J. BALDYGA 2,733,551

I INTERNAL GRINDER Filed Sept. 17, 1954 2 Sheets-Sheet 1 INVENTOR. JEN J fiat/djj l.

A TTOR/YE 4 Feb. 7, 1956 Filed Sept. 17, 1954 J. BALDYGA INTERNAL GRINDER 2 Sheets-Sheet 2 lai Ill.

INVENTOR. J W FBa/dyy a,

/{LWM rr-m VE) Un wd t te Pa? O V INTERNALGRINDEYR '4 Joseph .Baldyga, RosevillgMich. Application September17, 1954, No. 456,688 zcl'aniis. cl.s1-90 *My improvenieht pertains to a grinder adapted for operative application to circular apertures'in solid objects of such a nature as blocks or plates. r

The improvement, in its practical embodiment; consists' of a device which may be mounted upon framework or-a stand which supports a motor-for the operationof 30. The races, carried by the rotor, are marked 30a. At the rear end, the race 30a is secured in its place by means of a ring 31 threaded upon the rear 'endof the rotor.' An analogous ring, 32, islocated'at the front end of the'housing to prevent the displacement of the race 30.

some of the parts of the grinder andFwhich framework is provided with means for support and for adjustment of the position of the object to which the grinder is applied, the means including what is known as a longitudinal and across-feed.

'I shall now describe my improved grinder'with ref'-; erence to the accompanying drawings in 'which: p Fig. 1 is a perspective view of the grinder, the view including, in perspective, the: object to whichthe grinder is operatively applied; 7 r 5 Fig. 2 is a top elevational view of-the'grinder, with'parts shown in sectional views; n Fig; 3'is' a sectional view on line 3-3 of Fig. 2; f Fig. 4 is'a sectional view on line 4-4 0fFig.;3; V V

Fig. 5 is a front view of a member containing a circular hole, the view disclosing the position of 'the-gi'iiiding wheel with respect to the inner surface of the hole.

Similar numerals refer to similar parts throughout'the several viewsw; r j p f The stand upon which my attachment is mounted is generally identified by numeral 10. Thegrin'der, which is generally identified by numeral 11, includes a sub's'tan tially cylindrical housing 12 provided with a radiallyextending holder 13. The latter-contains a cavity 14 for engagement with an arm 15 which fits into the socket but isapart of thestand 10.

The boss' arm includes an axially-disposed, tapering member 16 terminatingwith a threaded stub 17,as shown in Fig. 1. The holder 'is,pr'efera'bly,split longitudinally, as shown at 19, but is provided with two'radially disposed' lugs'18 straddling the split. am of the lugs has: an opening 18a in alinement with the opening in the adjoining lug, the openings serving for receptio n of a bolt 9 which, in conjunctipnwithanut 9a servesto tighten the holder for a better frictionaleh'gagement with said arm 15.

The-h ousing 12 hasthe form ofa tliickwalled cylinder which is open at -both'-ends.- Axially-disposed therein is housing, with the exceptiomofthefront portion 22. The latter isoneend portionof said rotor, .its.diameter be ing substantiallye'qual t'othat of theouterdiamet'er of the housing. The annular surface of'said front portion is 45 the'rotor.

The'rotorcontains an axial aperture 34 which is open at both ends. Slidinglydisposed therein is a bar 35 which at its rear abuts athrust bearing 36 to which I shall referag'ain f f 1 l V f Secured to therear end ofthe housing is a closure including a cup-shaped unit 38 provided with a radiallyextending flange-39. The latter is provided with a plurality of holes for application of screws 37 by means of which the closure is connected to said housing. The cup-shaped unit 38 contains an axial bore 40. p p Axially mounted upon .the cup for rotationther'eon is asemispherical knob 41'which also is provided with an axialibore 142'. Passing therethrough and through'said bore 40 is apropelling screw 43 which at one end is keyed to said knob, as shown at44, for rotation therewith.

Awasher 45, threaded upon the screw at the end terminating within the knob, prevents axial movement of said screw inwardly in the direction of bar 35, while'an annular fin 46 uponsaid screw prevents its movement in the V opposite direction.

The inner end 47 of thepropelling screw 43 is threaded into a sle eve48 which is adapted to move longitudinally, thatis, axially, into said cup 38, but is prevented from rotating aboutits axis. This is effected by customary slot and key ineans, of which the key or rib is indicated by numeral 50. The sleeve, at what its inner end, abuts the above-mentioned thrust bearing 36. a The knob 41 is equipped with an annular band 51 bearing'a plurality of calibrations for reading against a stationary'mark 0, identified by numeral 52.

At the front end the rotor includes, onitsface, 'a diametrically-disposed. slideway 60 for engagement "with a spindle-carrying mechanism, generally identified by numeral 61. Rearwardly er said slideway, the front portion 22. of the. rotor contains a substantially diameterically-extending slot'53 opening outwardly through said slideway, as shown in Fig. 3, Located within the slot isa two-arm crank lever 54 pivotally mounted Onia shaft 551the ends of which are imbedded in the frontportion of Qne of the arms 56 of the lever bears against the' f'ront' end of the bar 35, The other arm 57,.called the actuating arm','is directed outwardly,.as shown in ni s zandsg" 3 3 f- Rearw'ardly'of the slideway 60 in the rotor, and parallel thereto, are two oblong recesses '62,"one on each side of the slideway, a'sshowi i in Fig.4. Each of the recesses contains a coiledspring 63which, atits lower end, bears againsta' movable lugfifif p l l ngaged'with the slideway by means of adovetail membeif- 8 6, tor a diametrical movementthereon"and to the akisffof the rotor, is a thickdisk, indicated generally a 6 5 Thedisk is 'provided withafdiametr ical n r ent the slot 53in the rotor, and is definedfatfone end,'ijby a transverse wall 67; On: each side of the slotinsaiddi'sk 65, but at points remotely located from said end wall 67, the disk is provided with transverse apertures for reception of screws 68by'means of which the disk is secured to the aforesaid lugs 64. Thus, the springswhich at their upper ends, as shown in Figs. 3 and 4, bear against the respective upper walls of recesses 62, urge the disk, by means of said bolts 68, in adownward direction. However, the movement of the disk under the force of said springs in said downward direction is checked by the arm 67 of the crank lever 54.

On its outer face, the disk 65 with a diametrical recess 69, and mounted on said disk for rotation therewith by Patented Feb. 7, 1 55.

being engaged by said recess, is a drum-like housing of a mechanism 61 designed to drive a spindle 70 atone end axially mounted within said housing and carrying at its outer end an abrading member 71. r

Air, under pressure, is delivered to said mechanism from a source of supply, such as a compressor, which is not shown, through a tube 72. The tubepasshown in Fig. 3, is threaded into a bore 73 in the housing 12 wherefrom the air is led into an annular groove 74 in therotor. A passageway 75, within the rotor, leads to the outer face of said rotor, specifically, to a nipple 76. The, nipple, in turn, is' connected by a flexible tube 77 to another nipple 78 leading to the interior ofthe mechanism-61 and serving as an inlet port for compressed fluid medium, such as air, by which medium the spindle is to be rotated about its axis, t

A screw '79, driven radially through the disk 65 into a frictional contact with the adjoining portions of the member 61, serves to keep said member against move? ment with respect to said disk;

The manner in which the device operates is as follows: The object 80 upon which the grinder is to'operate is clampedin place upon a suporting member 90 which is also the axis of the aperture 81, the spindle, carried with the rotor and carrying the abrading element, rotates in an orbit about said axis.

It will be obvious that some changes may be made in the structure of my device without departing beyond the range of inventive concept disclosed herein. And so, for instance, while I have employed compressed air to operate the spindle 70, said spindle could as well be operated by electric means. And while I have shown the device in conjunction with framework of a surface grinder, it will be understood that it maybe used with any suitable framework equipped with means for the adjustment of theposition of the object on which the grinder is to operate. 7

What I, therefore, wish to claim is as follows:

1. A grinding device including a stationary housing, a rotor disposed therein, said rotor having an axial bore and a diametrical slot opening outwardly toward one cndface, a two-arm lever mounted pivotally within said slot, a' bracket mounted on-said face for a diametrical movement thereon, the bracket including meansfor operaapart of the surface grinder 10. The supporting member is elevated to an adjustable position and adjusted laterally and longitudinally with respect to the position of the rotor of my device, which adjustments can be effected by i the customary longitudinal and cross feed means with which the stand 10 is equipped. Said means include a horizontal slideway 82 supported on cross-beams 83 for a movement laterally ,to the 'length of the slideway. Mounted upon the slideway, for a longitudinal movement thereon, is a slide 84. It is said slide 84 which serves as a base for said supporting member 90. Means which arenot shown are provided. to move the slideway vertically, all of themovements, vertical and horizontal,

being effected by means of screws or i racks. ;As the mechanism is in common use and forms no part of the applicants improvement, no further description thereof is necessary. i 7

Assuming that the inner surface of the circular aperture 81 in the object 80 is to be ground, the objectis shifted towards the spindle till'the spindle is in an axial position with respect to said aperture. diameter of the aperture exceeds that of the diameterof the abrading member 71. pg Next, the electric motor 26 may be started to bring about the rotation of the rotor, and compressed air m??- be admitted to mechanism 61 to bring about the rotation of the spindle 70. Thereupon, the knob 41, is turned manually to rotate the propelling screw 43 and. i0 impart a longitudinal movement, by means of the sleeve 48, to the bar which bears against-one arm 56 of the crank lever 54. As the bar pushes against said arm, the

opposite arm 57 bears against the cross-wall 6.! of the slot in the disk 65 and moves said disk'against the tension of the springs 63 diametrically with respect to the adjoining. end of the rotor. Because of said shift of-disk, the position of the spindleshifts to an ofi-center'position with respect to the axis of said rotor. The extent of. the shift is indicated'by calibrations on the annular band 51 on the knob 41, whichcalibrations are checked against the stationary mark 52 on the'fiange39 of the member 38 Thus, as the rotor is driven about itsfaxis, which is,

tive engagement with one of said arms, axially-movable means within the bore and bearing against the other arm of the lever, a calibrated knob mounted upon the housing at one end thereof and forming a closure therefor, the knob being operatively connectedwith the axially movable means to cause said means to bear against the last-named arm to cause a diametrical shift of the bracket, a'spindlecarrying. mechanism mounted on the bracket, an abrading element axially mounted on the spindle, motor means to drive the rotor about its axis, and compressed air means to actuate said mechanism to rotate the'spindle about its axis. i

2,.-A grinding'device including a stationary cylindrical housing, a rotor disposed therein and projecting from said housing at one end thereof, the rotor having an axial bore and being provided at the end projecting from thehousing with a diametrical slideway and a slot therein,

' andbeing further provided at said end with meansfor being operatively driven by a motor, a drum-like member connected to the rotor for a' sliding diametrical movement upon the outer face of the rotor, a two-arm lever pivotally mounted within said slot, one arm being in operative relation with respect to said member, air-driven motor means within said member, a spindle adapted to be driven by said motor means and axially projecting from saiddrum-like member, axially movable means within the bore adapted to bear against the other arm of the lever to cause a diametn'cal shift of the drum-like housing by means ofstheiiirst-named. arm, a calibrated semispherical knob covering the other end of thehousing and operatively connected tothe axially-movable means, and means to admit air to the drum-likemember to actuate the motor means therein and to impart a rotary movement to the spindle independently of the rotation of the rotor.

References Cited in thefile of this patent UNITED STATES PATENTS Switzerland Nov. 17, 1952 

